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/* SPDX-License-Identifier: GPL-2.0 */
static const char *__doc__ = "XDP loader\n"
" - Allows selecting BPF section --progsec name to XDP-attach to --dev\n";
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <locale.h>
#include <unistd.h>
#include <time.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <net/if.h>
#include <linux/if_link.h> /* depend on kernel-headers installed */
#include "../common/common_params.h"
#include "../common/common_user_bpf_xdp.h"
#include "../common/common_libbpf.h"
static const char *default_filename = "xdp_prog_kern.o";
static const struct option_wrapper long_options[] = {
{{"help", no_argument, NULL, 'h' },
"Show help", false},
{{"dev", required_argument, NULL, 'd' },
"Operate on device <ifname>", "<ifname>", true},
{{"skb-mode", no_argument, NULL, 'S' },
"Install XDP program in SKB (AKA generic) mode"},
{{"native-mode", no_argument, NULL, 'N' },
"Install XDP program in native mode"},
{{"auto-mode", no_argument, NULL, 'A' },
"Auto-detect SKB or native mode"},
{{"force", no_argument, NULL, 'F' },
"Force install, replacing existing program on interface"},
{{"unload", no_argument, NULL, 'U' },
"Unload XDP program instead of loading"},
{{"reuse-maps", no_argument, NULL, 'M' },
"Reuse pinned maps"},
{{"quiet", no_argument, NULL, 'q' },
"Quiet mode (no output)"},
{{"filename", required_argument, NULL, 1 },
"Load program from <file>", "<file>"},
{{"progsec", required_argument, NULL, 2 },
"Load program in <section> of the ELF file", "<section>"},
{{0, 0, NULL, 0 }, NULL, false}
};
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
const char *pin_basedir = "/sys/fs/bpf";
const char *map_name = "xdp_stats_map";
/* Pinning maps under /sys/fs/bpf in subdir */
int pin_maps_in_bpf_object(struct bpf_object *bpf_obj, struct config *cfg)
{
char map_filename[PATH_MAX];
int err, len;
len = snprintf(map_filename, PATH_MAX, "%s/%s/%s",
pin_basedir, cfg->ifname, map_name);
if (len < 0) {
fprintf(stderr, "ERR: creating map_name\n");
return EXIT_FAIL_OPTION;
}
/* Existing/previous XDP prog might not have cleaned up */
if (access(map_filename, F_OK ) != -1 ) {
if (verbose)
printf(" - Unpinning (remove) prev maps in %s/\n",
cfg->pin_dir);
/* Basically calls unlink(3) on map_filename */
err = bpf_object__unpin_maps(bpf_obj, cfg->pin_dir);
if (err) {
fprintf(stderr, "ERR: UNpinning maps in %s\n", cfg->pin_dir);
return EXIT_FAIL_BPF;
}
}
if (verbose)
printf(" - Pinning maps in %s/\n", cfg->pin_dir);
/* This will pin all maps in our bpf_object */
err = bpf_object__pin_maps(bpf_obj, cfg->pin_dir);
if (err)
return EXIT_FAIL_BPF;
return 0;
}
int main(int argc, char **argv)
{
struct bpf_object *bpf_obj;
int err, len;
struct config cfg = {
.xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_DRV_MODE,
.ifindex = -1,
.do_unload = false,
};
/* Set default BPF-ELF object file and BPF program name */
strncpy(cfg.filename, default_filename, sizeof(cfg.filename));
/* Cmdline options can change progsec */
parse_cmdline_args(argc, argv, long_options, &cfg, __doc__);
/* Required option */
if (cfg.ifindex == -1) {
fprintf(stderr, "ERR: required option --dev missing\n\n");
usage(argv[0], __doc__, long_options, (argc == 1));
return EXIT_FAIL_OPTION;
}
if (cfg.do_unload) {
if (!cfg.reuse_maps) {
/* TODO: Miss unpin of maps on unload */
}
return xdp_link_detach(cfg.ifindex, cfg.xdp_flags, 0);
}
len = snprintf(cfg.pin_dir, PATH_MAX, "%s/%s", pin_basedir, cfg.ifname);
if (len < 0) {
fprintf(stderr, "ERR: creating pin dirname\n");
return EXIT_FAIL_OPTION;
}
bpf_obj = load_bpf_and_xdp_attach(&cfg);
if (!bpf_obj)
return EXIT_FAIL_BPF;
if (verbose) {
printf("Success: Loaded BPF-object(%s) and used section(%s)\n",
cfg.filename, cfg.progsec);
printf(" - XDP prog attached on device:%s(ifindex:%d)\n",
cfg.ifname, cfg.ifindex);
}
/* Use the --dev name as subdir for exporting/pinning maps */
if (!cfg.reuse_maps) {
err = pin_maps_in_bpf_object(bpf_obj, &cfg);
if (err) {
fprintf(stderr, "ERR: pinning maps\n");
return err;
}
}
return EXIT_OK;
}
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